Project level: PhD

Many of the simplest models for dark matter assume that its particles cannot interact with each other. However, the observational limits that we have on this (from the Bullet Cluster) actually still permit a relatively high self-interaction rate - enough to possibly explain why we don't see that many cusps in dark matter density profiles (the "core-cusp problem"), why there are less satellite galaxies around our own than expected (the "missing satellite problem") and why small galaxies don't seem to have more stars (the "too big to fail problem"). The Global and Modular Beyond-the-Standard Model Inference Tool (GAMBIT) is a large-scale project aimed at combining all relevant constraints on all of the most compelling models for dark matter and other new particles. The project is to implement predictions and observational constraints on self-interacting dark matter models within GAMBIT, including from the large-scale structure of the Universe, and to use them carry out the most complete tests to date of the self-interacting dark matter hypothesis.

Starting points: arxiv:1705.07908, arxiv:1205.5809

Project members

Dr Pat Scott

ARC Future Fellowship
School of Mathematics and Physics